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Originally Posted by David.X5
Someone else reported something similar. It sounds like the air pump will "lock out" or "time out" if it's running too much. I have not seen any documentation on that though. The other one was fine after replacing the faulty rear air bag.
Of course, it is well known that the compressors will burn out if you let them run too much, such as with a leaky system, which is also a possibility here.
You should be able to check the sensors using inpa or something similar. Confirm they are reading in range. If it inflates to a correct level position when the key is on, I think that shows the sensor is working. Staying down all the time -may- point to a sensor, but it seems to have developed only after the other symptoms.
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The pump has a temperature sensor on it and when it overheats it activates the auto suspension inactive setting which shuts everything down and will throw a code on the display. The idea here is to try and save the motor on the pump.
I recently had a similar problem on my '03 e53 4.4 with 4 wheel air suspension and 140k miles. Passenger front was sagging and eventually led to the pump running often and then overheating. I replaced both front airshocks with arnott units and also rebuilt the pump with bagpiping andy's kit (which is terrific, btw) for good measure. Cleared the code and all was well.
Be sure to get an alignment afterward... Your mechanic can try to put the new shocks in the same location as the old ones by marking the bolt locations with a grease pencil (BMW suggests this in their documentation) but it's a guessing game, at best.
I've owned my vehicle since new and had the front air shocks replaced under warranty at 40k miles and now another set at 140k.!The rears have never been replaced - plan to tackle those this summer.